<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>pvsadsyn</title>
    <link rel="stylesheet" type="text/css" href="csound.css" />
    <meta name="generator" content="DocBook XSL Stylesheets V1.78.1" />
    <link rel="home" href="index.html" title="The Canonical Csound Reference Manual" />
    <link rel="up" href="OpcodesTop.html" title="Orchestra Opcodes and Operators" />
    <link rel="prev" href="pvread.html" title="pvread" />
    <link rel="next" href="pvsanal.html" title="pvsanal" />
  </head>
  <body>
    <div class="navheader">
      <table width="100%" summary="Navigation header">
        <tr>
          <th colspan="3" align="center">pvsadsyn</th>
        </tr>
        <tr>
          <td width="20%" align="left"><a accesskey="p" href="pvread.html">Prev</a> </td>
          <th width="60%" align="center">Orchestra Opcodes and Operators</th>
          <td width="20%" align="right"> <a accesskey="n" href="pvsanal.html">Next</a></td>
        </tr>
      </table>
      <hr />
    </div>
    <div class="refentry">
      <a id="pvsadsyn"></a>
      <div class="titlepage"></div>
      <a id="IndexPvsadsyn" class="indexterm"></a>
      <div class="refnamediv">
        <h2>
          <span class="refentrytitle">pvsadsyn</span>
        </h2>
        <p>pvsadsyn — 
      Resynthesize using a fast oscillator-bank.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp137419440"></a>
        <h2>Description</h2>
        <p>
      Resynthesize using a fast oscillator-bank.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp137495808"></a>
        <h2>Syntax</h2>
        <pre class="synopsis">ares <span class="command"><strong>pvsadsyn</strong></span> fsrc, inoscs, kfmod [, ibinoffset] [, ibinincr] [, iinit]</pre>
      </div>
      <div class="refsect1">
        <a id="idp137497920"></a>
        <h2>Initialization</h2>
        <p>
      <span class="emphasis"><em>inoscs</em></span> -- The number of analysis bins to synthesise. Cannot be larger than the size of fsrc (see <a class="link" href="pvsinfo.html" title="pvsinfo"><em class="citetitle">pvsinfo</em></a>), e.g. as created by <a class="link" href="pvsanal.html" title="pvsanal"><em class="citetitle">pvsanal</em></a>.  Processing time is directly proportional to inoscs.
    </p>
        <p>
      <span class="emphasis"><em>ibinoffset</em></span> (optional, default=0) -- The first (lowest) bin to resynthesise, counting from 0 (default = 0).
    </p>
        <p>
      <span class="emphasis"><em>ibinincr</em></span> (optional) -- Starting from bin ibinoffset, resynthesize bins ibinincr apart.
    </p>
        <p>
      <span class="emphasis"><em>iinit</em></span> (optional) --  Skip reinitialization. This is not currently implemented for any of these opcodes, and it remains to be seen if it is even practical.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp137504384"></a>
        <h2>Performance</h2>
        <p>
      <span class="emphasis"><em>kfmod</em></span> -- Scale all frequencies by factor kfmod. 1.0 = no change, 2 =  up one octave.
    </p>
        <p>
      <span class="emphasis"><em>pvsadsyn</em></span> is experimental, and implements the oscillator bank using a fast direct calculation method, rather than a lookup table. This takes advantage of the fact, empirically arrived at, that for the analysis rates generally used, (and presuming analysis using <a class="link" href="pvsanal.html" title="pvsanal"><em class="citetitle">pvsanal</em></a>, where frequencies in a bin change only slightly between frames) it is not necessary to interpolate frequencies between frames, only amplitudes. Accurate resynthesis is often contingent on the use of pvsanal with iwinsize = ifftsize*2.
    </p>
        <p> 
      This opcode is the most likely to change, or be much extended, according to feedback and advice from users. It is likely that a full interpolating table-based method will be added, via a further optional iarg. The parameter list to pvsadsyn mimics that for <a class="link" href="pvadd.html" title="pvadd"><em class="citetitle">pvadd</em></a>, but excludes spectral extraction.
    </p>
      </div>
      <div class="refsect1">
        <a id="idp137510000"></a>
        <h2>Examples</h2>
        <p>
      Here is an example of the pvsadsyn opcode. It uses the file <a class="ulink" href="examples/pvsadsyn.csd" target="_top"><em class="citetitle">pvsadsyn.csd</em></a>.
      </p>
        <div class="example">
          <a id="idp137511856"></a>
          <p class="title">
            <strong>Example 669. Example of the pvsadsyn opcode.</strong>
          </p>
          <div class="example-contents">
            <p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
            <pre class="programlisting">
<span class="csdtag">&lt;CsoundSynthesizer&gt;</span>
<span class="csdtag">&lt;CsOptions&gt;</span>
<span class="comment">; Select audio/midi flags here according to platform</span>
<span class="comment">; Audio out   Audio in</span>
-odac    <span class="comment">;;;RT audio I/O</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o pvsadsyn.wav -W ;;; for file output any platform</span>
<span class="csdtag">&lt;/CsOptions&gt;</span>
<span class="csdtag">&lt;CsInstruments&gt;</span>

<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 16
<span class="ohdr">nchnls</span> <span class="op">=</span> 1
<span class="ohdr">0dbfs</span> <span class="op">=</span> 1

<span class="comment">;; example written by joachim heintz 2009</span>

<span class="oblock">opcode</span> FileToPvsBuf, iik, Siiii
<span class="comment">;;writes an audio file at the first k-cycle to a fft-buffer (via pvsbuffer)</span>
Sfile, ifftsize, ioverlap, iwinsize, iwinshape <span class="opc">xin</span>
ktimek		<span class="opc">timeinstk</span>
<span class="octrl">if</span> ktimek <span class="op">==</span> 1 then
ilen		<span class="opc">filelen</span>	Sfile
kcycles	<span class="op">=</span>		ilen <span class="op">*</span> <span class="ohdr">kr</span><span class="comment">; number of k-cycles to write the fft-buffer</span>
kcount		<span class="opc">init</span>		0
<span class="olabel">loop</span><span class="op">:</span>
ain		<span class="opc">soundin</span>	Sfile
fftin		<span class="opc">pvsanal</span>	ain, ifftsize, ioverlap, iwinsize, iwinshape
ibuf, ktim	<span class="opc">pvsbuffer</span>	fftin, ilen <span class="op">+</span> (ifftsize <span class="op">/</span> sr)
		<span class="octrl">loop_lt</span>	kcount, 1, kcycles, <span class="olabel">loop</span>
		<span class="opc">xout</span>		ibuf, ilen, ktim
<span class="octrl">endif</span>
<span class="oblock">endop</span>


<span class="oblock">instr</span> 1
istretch	<span class="op">=</span>		p4<span class="comment">; time stretching factor</span>
ifftsize	<span class="op">=</span>		1024
ioverlap	<span class="op">=</span>		ifftsize <span class="op">/</span> 4
iwinsize	<span class="op">=</span>		ifftsize
iwinshape	<span class="op">=</span>		1<span class="comment">; von-Hann window</span>
ibuffer, ilen, k0		FileToPvsBuf	"fox.wav", ifftsize, ioverlap, iwinsize, iwinshape
p3		<span class="op">=</span>		istretch <span class="op">*</span> ilen<span class="comment">; set p3 to the correct value</span>
ktmpnt		<span class="opc">linseg</span>		0, p3, ilen<span class="comment">; time pointer</span>
fread 		<span class="opc">pvsbufread</span>  	ktmpnt, ibuffer<span class="comment">; read the buffer</span>
aout		<span class="opc">pvsadsyn</span>	fread, 10, 1<span class="comment">; resynthesis with the first 10 bins</span>
		<span class="opc">out</span>		aout
<span class="oblock">endin</span>

<span class="csdtag">&lt;/CsInstruments&gt;</span>
<span class="csdtag">&lt;CsScore&gt;</span>
<span class="stamnt">i</span> 1 0 1 20
<span class="stamnt">e</span>
<span class="csdtag">&lt;/CsScore&gt;</span>
<span class="csdtag">&lt;/CsoundSynthesizer&gt;</span>
</pre>
          </div>
        </div>
        <p><br class="example-break" />
    </p>
      </div>
      <div class="refsect1">
        <a id="idp137516144"></a>
        <h2>See Also</h2>
        <p>
      <a class="link" href="pvsanal.html" title="pvsanal"><em class="citetitle">pvsanal</em></a>,
      <a class="link" href="pvsynth.html" title="pvsynth"><em class="citetitle">pvsynth</em></a>,
      <a class="link" href="pvsadsyn.html" title="pvsadsyn"><em class="citetitle">pvsadsyn</em></a>
    </p>
      </div>
      <div class="refsect1">
        <a id="idp137520112"></a>
        <h2>Credits</h2>
        <p>
      </p>
        <table border="0" summary="Simple list" class="simplelist">
          <tr>
            <td>Author: Richard Dobson</td>
          </tr>
          <tr>
            <td>August 2001 </td>
          </tr>
        </table>
        <p>
    </p>
        <p>New in version 4.13</p>
      </div>
    </div>
    <div class="navfooter">
      <hr />
      <table width="100%" summary="Navigation footer">
        <tr>
          <td width="40%" align="left"><a accesskey="p" href="pvread.html">Prev</a> </td>
          <td width="20%" align="center">
            <a accesskey="u" href="OpcodesTop.html">Up</a>
          </td>
          <td width="40%" align="right"> <a accesskey="n" href="pvsanal.html">Next</a></td>
        </tr>
        <tr>
          <td width="40%" align="left" valign="top">pvread </td>
          <td width="20%" align="center">
            <a accesskey="h" href="index.html">Home</a>
          </td>
          <td width="40%" align="right" valign="top"> pvsanal</td>
        </tr>
      </table>
    </div>
  </body>
</html>
